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<Title>Overlapping Bar Chart</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Overlapping Bar Chart</p>
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<img src="images/overlapbar.png" width='580' height='280'>
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This example demonstrates a multi-bar chart in which the bars within a cluster overlaps.<br><br>
The overlapping effect is configured using <a href="BarLayer.setOverlapRatio.htm">BarLayer.setOverlapRatio</a>. This method allows you to specify overlapping ratio and order. In this example, the overlapping ratio is 0.5, while the default overlapping order is used. The default order is that the first data set will stay on top of the second data set, and so on.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/overlapbar.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the bar chart
double[] data0 = {100, 125, 156, 147, 87, 124, 178, 109, 140, 106, 192, 122};
double[] data1 = {122, 156, 179, 211, 198, 177, 160, 220, 190, 188, 220, 270};
double[] data2 = {167, 190, 213, 267, 250, 320, 212, 199, 245, 267, 240, 310};
String[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov",
    "Dec"};

// Create a XYChart object of size 580 x 280 pixels
XYChart c = new XYChart(580, 280);

// Add a title to the chart using 14pt Arial Bold Italic font
c.addTitle("Product Revenue For Last 3 Years", "Arial Bold Italic", 14);

// Set the plot area at (50, 50) and of size 500 x 200. Use two alternative background colors
// (f8f8f8 and ffffff)
c.setPlotArea(50, 50, 500, 200, 0xf8f8f8, 0xffffff);

// Add a legend box at (50, 25) using horizontal layout. Use 8pt Arial as font, with transparent
// background.
c.addLegend(50, 25, false, "Arial", 8).setBackground(Chart.Transparent);

// Set the x axis labels
c.xAxis().setLabels(labels);

// Draw the ticks between label positions (instead of at label positions)
c.xAxis().setTickOffset(0.5);

// Add a multi-bar layer with 3 data sets
BarLayer layer = c.addBarLayer2(Chart.Side);
layer.addDataSet(data0, 0xff8080, "Year 2003");
layer.addDataSet(data1, 0x80ff80, "Year 2004");
layer.addDataSet(data2, 0x8080ff, "Year 2005");

// Set 50% overlap between bars
layer.setOverlapRatio(0.5);

// Add a title to the y-axis
c.yAxis().setTitle("Revenue (USD in millions)");

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "",
    "title='{xLabel} Revenue on {dataSetName}: {value} millions'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Overlapping Bar Chart&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Overlapping Bar Chart
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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<br><hr class="separator"><div class="copyright">&copy; 2022 Advanced Software Engineering Limited. All rights reserved.</div>
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